| Marek Vasut | e8de0fa | 2011-11-26 08:11:32 +0100 | [diff] [blame^] | 1 | /* |
| 2 | * PXA CPU information display |
| 3 | * |
| 4 | * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License as |
| 8 | * published by the Free Software Foundation; either version 2 of |
| 9 | * the License, or (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| 19 | * MA 02111-1307 USA |
| 20 | */ |
| 21 | |
| 22 | #include <common.h> |
| 23 | #include <asm/io.h> |
| 24 | #include <errno.h> |
| 25 | #include <linux/compiler.h> |
| 26 | |
| 27 | #define CPU_MASK_PXA_REVID 0x00f |
| 28 | |
| 29 | #define CPU_MASK_PXA_PRODID 0x3f0 |
| 30 | #define CPU_VALUE_PXA25X 0x100 |
| 31 | #define CPU_VALUE_PXA27X 0x110 |
| 32 | |
| 33 | static uint32_t pxa_get_cpuid(void) |
| 34 | { |
| 35 | uint32_t cpuid; |
| 36 | asm volatile("mrc p15, 0, %0, c0, c0, 0" : "=r"(cpuid)); |
| 37 | return cpuid; |
| 38 | } |
| 39 | |
| 40 | int cpu_is_pxa25x(void) |
| 41 | { |
| 42 | uint32_t id = pxa_get_cpuid(); |
| 43 | id &= CPU_MASK_PXA_PRODID; |
| 44 | return id == CPU_VALUE_PXA25X; |
| 45 | } |
| 46 | |
| 47 | int cpu_is_pxa27x(void) |
| 48 | { |
| 49 | uint32_t id = pxa_get_cpuid(); |
| 50 | id &= CPU_MASK_PXA_PRODID; |
| 51 | return id == CPU_VALUE_PXA27X; |
| 52 | } |
| 53 | |
| 54 | #ifdef CONFIG_DISPLAY_CPUINFO |
| 55 | static const char *pxa25x_get_revision(void) |
| 56 | { |
| 57 | static __maybe_unused const char * const revs_25x[] = { "A0" }; |
| 58 | static __maybe_unused const char * const revs_26x[] = { |
| 59 | "A0", "B0", "B1" |
| 60 | }; |
| 61 | static const char *unknown = "Unknown"; |
| 62 | uint32_t id; |
| 63 | |
| 64 | if (!cpu_is_pxa25x()) |
| 65 | return unknown; |
| 66 | |
| 67 | id = pxa_get_cpuid() & CPU_MASK_PXA_REVID; |
| 68 | |
| 69 | /* PXA26x is a sick special case as it can't be told apart from PXA25x :-( */ |
| 70 | #ifdef CONFIG_CPU_PXA26X |
| 71 | switch (id) { |
| 72 | case 3: return revs_26x[0]; |
| 73 | case 5: return revs_26x[1]; |
| 74 | case 6: return revs_26x[2]; |
| 75 | } |
| 76 | #else |
| 77 | if (id == 6) |
| 78 | return revs_25x[0]; |
| 79 | #endif |
| 80 | return unknown; |
| 81 | } |
| 82 | |
| 83 | static const char *pxa27x_get_revision(void) |
| 84 | { |
| 85 | static const char *const rev[] = { "A0", "A1", "B0", "B1", "C0", "C5" }; |
| 86 | static const char *unknown = "Unknown"; |
| 87 | uint32_t id; |
| 88 | |
| 89 | if (!cpu_is_pxa27x()) |
| 90 | return unknown; |
| 91 | |
| 92 | id = pxa_get_cpuid() & CPU_MASK_PXA_REVID; |
| 93 | |
| 94 | if ((id == 5) || (id == 6) || (id > 7)) |
| 95 | return unknown; |
| 96 | |
| 97 | /* Cap the special PXA270 C5 case. */ |
| 98 | if (id == 7) |
| 99 | id = 5; |
| 100 | |
| 101 | return rev[id]; |
| 102 | } |
| 103 | |
| 104 | static int print_cpuinfo_pxa2xx(void) |
| 105 | { |
| 106 | if (cpu_is_pxa25x()) { |
| 107 | puts("Marvell PXA25x rev. "); |
| 108 | puts(pxa25x_get_revision()); |
| 109 | } else if (cpu_is_pxa27x()) { |
| 110 | puts("Marvell PXA27x rev. "); |
| 111 | puts(pxa27x_get_revision()); |
| 112 | } else |
| 113 | return -EINVAL; |
| 114 | |
| 115 | puts("\n"); |
| 116 | |
| 117 | return 0; |
| 118 | } |
| 119 | |
| 120 | int print_cpuinfo(void) |
| 121 | { |
| 122 | int ret; |
| 123 | |
| 124 | puts("CPU: "); |
| 125 | |
| 126 | ret = print_cpuinfo_pxa2xx(); |
| 127 | if (!ret) |
| 128 | return ret; |
| 129 | |
| 130 | return ret; |
| 131 | } |
| 132 | #endif |